太平洋三海区热液烟囱物的地球化学标型特征研究

The Geochemical Standard Type Characters of Hydrother malChimney Material in Three Areas of the Pacific Ocean

以成因矿物学的理论和方法 ,运用电子探针、中子活化、常规化学分析和稳定同位素分析等多种地球化学实验测试技术 ,较系统地研究了太平洋三区四地热液烟囱物的地球化学组成和变化 ,揭示了研究区不同热液喷发类型中的地球化学标型特征。高温热液类型的硫化物 ,由高温热液矿物组成 ,除本身富含 Fe,Zn,Cu,Pb等金属元素外 ,氧同位素换算温度也表现最高或中高 ;中低温热液类型的烟囱物 ,金属元素含量较低 ,氧同位素换算温度也表现较低。

In this paper, many kinds of geochemical testing tech nique, such as electron probe, neutron activation, conventional chemical and sta ble isotope analysis were applied to determine the geochemical components and c hanges of hydrothermal chimney samples taken from four areas of the Pacific Ocea n. According to the theory and methods of genetic mineralogy we can reveal the g eochemical standard type characters of these samples formed in different hydroth ermal eruption types. High temperature hydrothermal sulfide is composed of high temperature hydrothermal minerals rich in metal elements, such as Fe, Zn, Cu, Pb . The oxygen isotope conversion temperature of this kinds of sulfide is very hig h or mid-high. The content of metal elements and the oxygen isotope conversion temperature for the middle-low temperature type sultide of the Mariana Trough a re low. Therefore, we can come to the conclusion that hydrothermal minerals with different standard type characters have close relations to the condition of hyd rothermal eruptions.